Further information
Troubleshooting
If you experience problems when installing or using the ServSwitch Secure unit, please check through this section for a possible solution. If your problem is not listed here and you cannot resolve the issue, then please refer to the ‘Getting assistance’ section.
No video from computer
•This is most likely to be associated with having the wrong DDC data loaded into the ServSwitch. Computers often need read the correct DDC data before they will output a video signal. If digital DDC data is presented
to a computer’s analog video port, a video signal will not be generated. Conversely, if analog DDC data is presented to a computer’s digital video port, a video signal will also not be generated. Remember that the ServSwitch only reads the DDC data from your monitor when the ServSwitch is first powered on. To ensure that your monitor’s DDC data is read and stored correctly, ensure that it is attached and powered on when you switch on your ServSwitch.
Video from some computers only
•Remember that the ServSwitch does not convert digital video signals to analog signals and vice versa so it is not generally possible to mix digital and analog inputs. Mixed systems are possible in certain special circumstances but these will require specialist assistance from Black Box technical support.
Summary of threats and solutions
This section provides a list of potential security threats that the ServSwitch Secure might face during operation and the special steps that have been taken to counteract them.
Threat | Solution |
|
|
Microprocessor | Unidirectional data flow is enforced by |
malfunction or | hardware “data diodes” so data isolation |
unanticipated software | doesn’t rely on software integrity. |
bugs causing data to flow |
|
between ports. |
|
|
|
Subversive snooping | Carefully shielded metal case with dual |
by means of detecting | shielding in critical areas. |
electromagnetic radiation |
|
emitted from the |
|
equipment. |
|
|
|
Detection of signals | No connections to sensitive analog inputs |
on one computer by | (such computer microphone ports) are |
monitoring for crosstalk | provided. Minimum crosstalk separation |
(leakage) signals on | of 60dB provided between signals from |
another computer. | one computer and input or I/O signals to |
| another computer. |
|
|
Malicious modification of | Data isolation is assured by hardware |
microprocessor software | and so is not compromised by any |
causing data to leak | changes to the microprocessor |
between ports. | software. Microprocessors use one time |
| programmable memory so flash upgrades |
| are not possible. Case uses |
| screws which can be protected by tamper |
| proof seals. |
|
|
Buffered data within a | Keyboard and mouse are powered down |
keyboard or mouse is sent | and reset between each switchover to |
to the wrong computer | ensure that all buffers are cleared out. |
after switchover. |
|
|
|
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